Friend of Victory (feminine). Wife of Loki. Mother of Nari/Narfi and, in some sources, Vali. There’s something very, for lack of a better term, doomed about Sigyn. Something unhappy in her circumstances that often goes under the radar when we talk about the gods as a whole.
After all, we hear little from her, and most of the kennings in which she is mentioned or referenced are related to burdens and fetters. In the Eddas, her fate is one of a protector, in that she holds a bowl over Loki to stop the endless venom when he is restrained and bound in punishment. Doomed to witness his inevitable pain each time she must leave to empty the bowl. Doomed to see the entrails of her son used as his binding. Doomed to be another victim, seemingly punished alongside her husband despite no wrongdoings of her own. Yet, she remains.
We know little about her outside of her relationship with the trickster god, but her protective nature cannot be questioned. Her resolve remains undisputed, and her loyalty unquestioned. Whatever stories have potentially been lost about Sigyn, we can say that they potentially added more detail about her love of Loki, the circumstances of how they became married, and her relationship with the other Æsir.
Today, many heathens see her as a goddess not defined by her attestations, but rather through the etymology of her name – victory. Partnered with her protective actions, she is seen by some as a sort of guardian of right action. To protect those that cannot defend themselves, and to remain steadfast in the face of wrongdoing.